YS 
/O Fronds not glandular 
12 Fronds thin-membranous; ferns of moist situations 
“4. Fronds linear-lanceolate, erect, rather strictly so, 
/S in tufts 11. Woodsia oregana 
/4 Fronds lence-ovate, spreading or even_laxly. 
; 2 reclining on moist rocks 9, Cystopteris fragilis 
/2 Fronds firm, somewhat thick-textureds ferns of dry rock 
/& crevice habitats | 
/A4 Blade of frond about twice as long as broad, smooth or 
/ 8 inconspicuously thinly-hairy beneath 4, Cheilanthes 
siliquosa 
iA Blade of frond 4-7 times as long as broad, this and 
4 rachis densely hairy-tomentose beneath 
4, Cheilanthes gracillima 
Q 4b. Fronds mostly more than 20 cme long, the blades ample and 
expanded; stipe and rachis usually dull straw-colored; 
|Z, ( ferns chiefly of moderate to deep shade ef weet anc sround 
springs 
/C Basal pair of pinnae unlike all the others of frond, with 
very unequal outline, the basal-most divisions ; 
/A { downwardly directed (twice as long as those supcsteolp oe 
\ placeds stipe chaffy with thin light brown scales 
8e Dryopteris dilatata 
/Q Basal pair of pinnae (in outling essentially like those of 
i 
{ 
/A remainder of frond 
)'‘2. Fronds 10-15 cm, wide, rather strictly erect, the pinnae 
[ef . | 
unper verts Se Athyrium americanum 
a Ae i. * 2 
Dork Sead 
- La pinnatisect, crowded on the rachis, especially 
\ 
» 
